Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c5b73f933ddba6…

MALICIOUS

PDF

40.3 KB Created: 2020-08-03 15:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef9e6801e7e87a7a9216a565210da51a SHA-1: 87c64550a12b7c827737d1a8f3b420aa80340068 SHA-256: b9c5b73f933ddba64b685188d5f1b8ea8955ebc5ae0b073cf44ef8f72715c51e
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wb?keyword=ocenaudio%20tutorial%20pdf', suggesting a lure to download or view content. The presence of a 'download button' heuristic further supports this. The primary attack vector appears to be a link farm designed to redirect users to malicious sites.

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wb?keyword=ocenaudio%20tutorial%20pdf
    • http://files.upperskagitlibraryfoundation.org/uploads/1/3/1/6/131607930/ec166a519f.pdf
    • http://files.harlesdencommunityhub.com/uploads/1/3/0/7/130739570/sataduvoxepolusun.pdf
    • http://melute.crosspointevb.com/uploads/1/3/0/7/130775953/4917679.pdf
    • http://files.houseonreddirtroad.com/uploads/1/3/0/9/130969183/tifufutukuregekemaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5349/0071/files/buteboli.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/83873913330.pdf
    • https://cdn.shopify.com/s/files/1/0431/1711/7589/files/2880769817.pdf
    • https://cdn.shopify.com/s/files/1/0430/6681/8721/files/takizinufot.pdf
    • https://cdn.shopify.com/s/files/1/0429/4947/6518/files/35392912493.pdf
    • https://cdn.shopify.com/s/files/1/0437/0916/9815/files/maneguziku.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/jovesirafezeboja.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/ziwalonegono.pdf
    • https://cdn.shopify.com/s/files/1/0429/9105/9097/files/20223026833.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/88231300979.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4274895189.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/bodiwisufovipilefej.pdf
    • https://cdn.shopify.com/s/files/1/0435/0876/0735/files/balamiveworu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f76.bin
3b4640e986e763adf0d30ee4b96dd5592af2027260c819c8c86758ad03e4ae38
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F76 4996 bytes
font_01_sfnt_off00007084.bin
00a3fbc8669a5120e9f58911802812243db3dcc3a842892a336a5c81a7aadd85
pdf-font-stream PDF embedded font (sfnt) at offset 0x7084 11472 bytes